14d9c1881d
Only print the warning that gopclntab can not be read for the first image (i.e. the executable file), also change the returned when neither DWARF nor gopclntab are found to preserve the DWARF error.
75 lines
1.8 KiB
Go
75 lines
1.8 KiB
Go
package proc
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import (
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"bytes"
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"debug/buildinfo"
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"debug/elf"
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"debug/gosym"
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"encoding/binary"
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"fmt"
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"strings"
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)
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// From go/src/debug/gosym/pclntab.go
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const (
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go12magic = 0xfffffffb
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go116magic = 0xfffffffa
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go118magic = 0xfffffff0
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go120magic = 0xfffffff1
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)
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// Select the magic number based on the Go version
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func magicNumber(goVersion string) []byte {
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bs := make([]byte, 4)
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var magic uint32
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if strings.Compare(goVersion, "go1.20") >= 0 {
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magic = go120magic
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} else if strings.Compare(goVersion, "go1.18") >= 0 {
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magic = go118magic
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} else if strings.Compare(goVersion, "go1.16") >= 0 {
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magic = go116magic
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} else {
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magic = go12magic
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}
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binary.LittleEndian.PutUint32(bs, magic)
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return bs
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}
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func readPcLnTableElf(exe *elf.File, path string) (*gosym.Table, error) {
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// Default section label is .gopclntab
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sectionLabel := ".gopclntab"
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section := exe.Section(sectionLabel)
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if section == nil {
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// binary may be built with -pie
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sectionLabel = ".data.rel.ro"
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section = exe.Section(sectionLabel)
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if section == nil {
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return nil, fmt.Errorf("could not read section .gopclntab")
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}
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}
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tableData, err := section.Data()
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if err != nil {
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return nil, fmt.Errorf("found section but could not read .gopclntab")
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}
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bi, err := buildinfo.ReadFile(path)
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if err != nil {
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return nil, err
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}
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// Find .gopclntab by magic number even if there is no section label
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magic := magicNumber(bi.GoVersion)
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pclntabIndex := bytes.Index(tableData, magic)
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if pclntabIndex >= 0 {
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tableData = tableData[pclntabIndex:]
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}
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addr := exe.Section(".text").Addr
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lineTable := gosym.NewLineTable(tableData, addr)
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symTable, err := gosym.NewTable([]byte{}, lineTable)
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if err != nil {
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return nil, fmt.Errorf("could not create symbol table from %s ", path)
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}
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return symTable, nil
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}
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